41508

Appears in sequences

• a(n) = T(n,[ n/2 ]), where T is the array in A026268.at n=15A026297
• The number of primes in A013918 less than 10^n.at n=12A189153
• The Wiener index of the para-polyphenyl chain with n hexagons (see the Dou et al. and the Deng references).at n=11A216112
• Number of partitions p of n such that 3*min(p) + (number of parts of p) is not a part of p.at n=40A238543
• a(n) is the least integer k such that there are n values of i <= k for which gpf(i^2 + 1) = gpf(k^2 + 1), where gpf(x) is the greatest prime factor of x.at n=36A258840
• Numbers k such that Bernoulli number B_{k} has denominator 1919190.at n=24A295595
• Number T(n,k) of permutations p of [n] with no fixed points such that |{ j : |p(j)-j| = 1 }| = k; triangle T(n,k), n >= 0, 0 <= k <= n, read by rows.at n=60A323671